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Home >> Dodge and Ram >> 2002 >> Durango Base, 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - JTEC >> Diagnostic Tests >> DTC P0071: Battery Temp Sensor Performance >> Testing

DTC P0071: Battery Temp Sensor Performance: Testing

  1. Turn the ignition on, with the engine off. With the DRBIII®, read DTCs. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, go to step  7.
  2. Turn the ignition off. Disconnect the BTS harness connector. Turn the ignition on, with the engine off. With the DRBIII®, read the Battery Temp Sensor voltage. Is the voltage more than one 4.6 volts? If yes, go to next step. If no, go to step  4.
  3. Turn the ignition off. Using a jumper wire, jumper across the BTS harness connector. Turn the ignition on, with the engine off. With the DRBIII®, read the Battery Temp Sensor voltage. Is the voltage less than one volt? If yes, replace the BTS. If no, go to next step.
    4. NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal-to-wire connection. Ensure the voltmeter leads are connected for positive polarity.
  4. Reconnect BTS harness connector. Perform a voltage drop test by backprobing the Sensor Ground circuit at the BTS harness connector and PCM harness connector. Start the engine and allow it to idle. Is the voltage less than 0.10 volt? If yes, go to next step. If no, repair the high resistance in the Sensor Ground circuit.
    5. NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal-to-wire connection. Ensure the voltmeter leads are connected for positive polarity.
  5. Turn the ignition off. Perform a voltage drop test by backprobing the BTS Signal circuit at the BTS harness connector and PCM harness connector. Start the engine and allow it to idle. Is the voltage less than 0.10 volt? If yes, go to next step. If no, repair the high resistance in the BTS Signal circuit.
  6. There are no possible causes remaining, replace the PCM.
    7. WARNING: When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
  7. Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
    • With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
    • Review the DRBIII® Freeze Frame information. Attempt to duplicate condition that caused DTC to set.
    • Refer to any Technical Service Bulletin (TSB) that may apply.
    • With the DRBIII® as a dual-channel lab scope and the Miller Special Tool (6801), backprobe the BTS Signal circuit at the BTS harness connector and PCM harness connector. Start the engine and look for any differences in the 2 patterns.
    • Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
    • Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

    Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.

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